Fig. 1From: Exosomal miRNA-128-3p from mesenchymal stem cells of aged rats regulates osteogenesis and bone fracture healing by targeting Smad5a MSCs adopted a spindle-like morphology, whereas aged MSCs demonstrated a flattened morphology compared to young MSCs (scale: 100 μm). b Toluidine Blue, Oli Red O and ALP staining of MSCs (scale: 100 μm). c, d MSCs were positive for CD44 and CD90 but negative for CD34 or CD45Back to article page